Heating-furnace.



L..G. HANMER.

HEATING:- FURNACE.

APPLICATION FILED AUG. 17,1908.

924,774. r Patented June 15,1909.

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mvszvmk Lewis C .Hanmer L. G. HANMER.

HEATING FURNAGE. APPLICATION FILED we. 17, 1908.

' Patented June 15,1909.

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nnrrnn STATES rarer ornrcn LEWIS C. HANMER, OF DETROIT, MICHIGAN,ASSIGNOR TO DIMPSEY-HANMER COMPANY, OF DETROIT, MICHIGAN, A CORPORATIONOF MICHIGAN.

HE ATING-FURNACE To all whom it may concern:

Be it known that I, LEWIS C. HANMER, a citizen of the United States ofAmerica, residing at Detroit, in the county of Wayne and State ofMichigan, have invented certain new and useful Improvements inHeating-Furnaces, of which the following is a specification, referencebeing had therein to t 1e accompanying drawings.

This invention relates to improvements in hot air furnaces in which theproducts of combustion and hot gases are caused to cireulate around aperforated fire-pot where they are ignited and burned, the hot residuebeing circulated to give off its heat and become cooled before enteringthe smol epipe.

The object of the invention is to provide a simple, cheap and efficientconstruction in which such circulation is provided for and whichembodies certain other new and use ful features as hereinafter morefully described, reference being had to the accom panying drawings inwhich Figure 1 is a vertical section of a furnace embodying theinvention; Fig. 2 is a transverse section substantially on the line a: xof Fig. 1; Fig. 3 is a front elevation showing the casing in section andparts broken away to show the construction; and Fig. 4 is a gransversesection upon the line of As shown in the drawings 1 is a circular baseportion forming an ash-pit 2 having a clean-out door 3. Resting upon thebase portion is a circular fire-pot 4 provided with perforations 5 inits sides throughout its height and it is preferably made somewhatlarger in diameter at the top than at the bottom. Resting upon the topof the firepot is a dome 7 having an upper closed end forming aradiating surface 8 and at its front side having cast integral therewitha fuelchute 9 provided at its outer end with a fueldoor 10 through whichfuel is shoveled into the furnace.

Surrounding the fire-pot 4 and also resting upon the base 1 is asmoke-consuming chamber 11 made in two parts which are flanged andbolted together at their meeting edges. In the rear wall of the domenear its upper end is a smoke-hole 12 which opens into a verticalsmoke-flue 13 extending downward the length of the dome and opening atits lower end into the top of the smoke-chamber 11 at the rear side ofthe Specification of Letters Patent.

Application filed. August 17, 1908.

Patented June 15, 1909.

Serial No. 448,911.

lirepot. In the rear side of the passage 13 opposite the smoke-hole inthe dome is a short rearwardly extending circular pipe or passage 1% inwhich is pivoted a damper 15 to close the same, said damper beingoperated by means of a rod 26 extending forwardly over the dome.

Partially surrounding the upper end of the dome and smoke-passage 13 isa radiating chamber 16 which, in plan view, is in the form of ahorse-shoe with its ends adjacent to each side of the fuel-chute 9.Vertical passages or pipes 17 extend upward from the top of thesmeke-consuming chamber at each side of the said chute and open into thebottom of the radiating chamber at its ends, said chamber beingsupported at its front ends by said pipes and at its rear side by theshort smoke-pipe 14 which is secured thereto and opens through the wallof the radiating chamber. Leading from the radiating chamber directlyopposite the end of the pipe 14 is the smoke-pipe 18 for conducting theproducts of combustion to the chimney.

A bottom is formed for the smoke-consuming chamber by a wall 19 on thebase portion extending inward toward the fire-pot and provided with aseries of openings 20 to permit any ash which may fall through theperforations of the fire-pot to pass down through the openings into theash-pit. Beneath the wall 19 is supported upon brackets 21 a movablering 22 which is also provided with openings to correspond with theopen.- ings in the wall and by turning this ring the openings may beopened or closed.

Grate-bars 23 are supported within the base 1 beneath the fire-pot andeach is provided with a forwardly projecting stem, upon which stems aresecured gears 24 meshing with each other in pairs and actuated by asuitable lever to engage the squared end 25 of one of the stems of eachpair.

The fuel-chute 9 is cast with parallel longi tudinally extendingchannels 27 in its bottom to receive the water pipes 28 which areconnected to the ends of a semi-circular or ring-pipe 29 within thedome, one of the An outer casing or jacket 30 formed of sheet metal inthe usual manner incloses the Whole structure and leading from the topof this casing are the hot air pipes 31 to conduct the heated air to theparts of the building to be heated.

hen the damper 15 is turned by its operating rod 26 to open position, asshown in dotted lines in Fig. 1, the products of combustion pass upwardfrom the fire-pot into the dome and out through the smoke-hole therein,past the damper, across the radiating chamber and out through thesmoke-pipe, making a direct draft. When the damper is in closedposition, as shown in full lines, the smoke and products of combustionpassing out through the smoke-hole in the dome are forced to passdownward through the vertical smoke-passage 13 into the smoke-consumingchamber where the hot gases come in contact with jet flames issuing fromthe perforations in the fire-pot and are ignited and burned in saidchamber. The residue of combustion passes around the fire-pot and upthrough the vertical pipes 17 into the forward ends of the radiatingchamber and thence around at each side of the dome in said chamber tothe smoke-pipe at the back. The capacity of the radiating chamber isgreater than that of the vertical pipes and upon entering said chamber,the products of combustion are quickly cooled by coming in contact withthe extended surface of the chamber which is heated thereby and, inturn, heats the air passing upward around it and between it and the dome7, a considerable space being provided between said chamber and dome.

.VVhile I have shown my invention as applied to furnaces it is obviousit may be used as well on stoves or any other form of heaters.

Having thus fully described my invention what I claim is 1. In a heater,the combination of a firepot having openings in its sides, a chambersurrounding said fire-pot, a dome extending upward from said firepot,means for con ducting the products of combustion from the upper end ofthe dome into the chamber around the firepot, a radiating chamberadjacent to the upper portion of the dome and communicating with saidchamber and a smoke-pipe communicating with said radiating chamber.

2. In a heater, the combination of a firepot, a chamber surrounding saidfirep0t, a dome extending upward. from the fire-pot having a passagecommunicating with the upper portion of the dome and with the chamberaround the fire-pot, a radiating chamber around the upper portion of thedome and passage and communicating with the said chamber around. thefire-pot, and having a short passage connecting the radieting chamberand said passage, a damper in said short passage and a smoke-pipe leading from the radiating chamber at a point opposite said short passage.

In a heater, the combination of a firepot, a chamber surrounding saidfire-pot, a dome extending upward from said fire-pot having a passagecommunicating with the upper portion of said dome at its rear side andopening into the top of the chamber around the fire-pot, a radiatingchamber extending a portion of the way around the upper end of the domeand connected at its ends near the front of the dome to the chamberaround the firepot and a smoke-pipe connected to the radiating chamberat its rear side.

4. In a heater, the combination of a firepot having openings in itssides, a smoke-consuming chamber surrounding said lire-pot,

a dome extending upward from the fire-pot having a vertical passage atthe back of the dome communicating with the upper end of the dome andwith the top of the consuming chamber, a radiating chamber extendingaround the upper end of the dome and passage and spaced therefrom, meansconnecting the front ends of said radiating chamber with the consumingchamber near its front side, a pipe extending across the space betweenthe vertical passage and the ra-T diating chamber, means for closingsaid pipe and a smoke-pipe opening into the radiating chamber oppositethe end of the pipe.

5. In a heater, the combination of a firepot, a chamber surrounding thefire-pot, a IOO dome extending upward from the fire-pot having asmoke-hole near its upper end and a vertical passage to receive theproducts of combustion from the smokehole and conduct them into the topof the chamberiI05 around the fire-pot, a radiating chamber ofhorse-shoe shape in plan view extending around the upper end of the domeand passage, vertical pipes extending upward from the top of the chamberaround the fire-" 1 pot and opening into the radiating chamber at itsends, and a smoke-pipe opening into the radiating chamber at its rearside opposite the vertical passage.

6. In a heater, the combination of a fire- 1 pot having openings in itssides, a consuming chamber surrounding the fire-pot, a dome extendingupward from the fire-pot, a fuelchute opening into the forward'side ofthe dome above the fire-pot, said dome having a vertical passage at therear side of the dome communicating with the dome near its upper end andwith the top of the consuming chamber, a radiating chamber extendingpartially around the dome and spaced therefrom with 7125 its forwardends adjacent to the sides of the fuel-chute, vertical pipes extendingupward from the consuming chamber and opening into the forward ends ofthe radiating chamher and supporting said chamber at the forward side ofthe dome, a pipe connected to the radiating chamber and to the upper endof the vertical passage at its opposite ends, a damper in said pipe, anda smoke-pipe comiectedto the radiating chamber opposite the end of thepipe.

7. In a heater, the combination of a base section forming an ash-pit, afire-pot supported upon the base section and having openings in itssides, a consuming chamber surrounding the fire-pot and supported uponthe base section with a space between its lower end and the sides of thefire-pot, said consuming chamber being made in two parts which areflanged and bolted together at their meeting edges, a wall on the baseportion extending inward toward the fire-pot having a series of openingsand forming the bottom of the consuming chamber, means for opening andclosing said openings in said wall, a dome extending upward from the topof the fire-pot and having a closed upper end forming a radiatingsurface, said dome having a vertical passage at the rear side of thedome opening at its lower end into the consuming chamber andcommunicating at its upper end with the upper end. of the dome 1 througha smoke-hole in the dome, a pipe f leading rearwardly from the upper endof the 1 vertlcal passage, a damper in said pipe, a

radiating chamber extending partially around the upper end of the domeand connected to and supported intermediate its ends by the pipe,vertical pipes on the consuming chamber near its forward side openinginto the bottom of the radiating chamber at its ends and supporting saidends, and a smoke-pipe opening into the radiating chamber opposite thepipe.

8. In a heater, the combination of a firepot having openings in itssides, a chamber surrounding said fire-pot, a dome extending upward fromsaid fire-pot, means for c011- ducting the products of combustion fromthe dome into the chamber around the fire-pot, a radiating chambercommunicating with said fire-pot chamber and a smoke-pipe communicatingwith said radiating chamber.

In testimony whereof I afliX my signature in presence of two witnesses.

LEI/VIS C. IIANMER.

IVitnesses C. R. SrIoKNEY, OT'ro F. BARTHEL.

